An angled gas port would move the bore hole down the barrel some; which would logically reduce the pressure slightly due to elongating the system without requiring a different gas tube.
As far as port erosion... that limits out at some point and really has never been a practical concern.
In 25 years of AR shooting, I've never seen a problem with the standard gas port configuration. (other than imbeciles spec'ing massively over-sized ports)
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
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